The CentOS development team is pleased to announce the release of CentOS 5 (Beta) for i386 and x86_64. This is a beta frozen release. Which implies there are known security issues with packages in this release, and there will be no updates provided in order to resolve those issues. This release is not meant to be used in production and there are no upgrade paths guaranteed from this release. As a user, you should consider this beta release as unsuitable for deployment but usable in a test environment to look at new technologies and changes in the distribution since CentOS 4.
Read the full release announcement and release notes for more information. Interested beta testers can download the DVD media via BitTorrent: CentOS-4.92-i386-bin-DVD (3.34GB), CentOS-4.92-x86_64-bin-DVD.iso (3.88GB).